320mm Universal Motorcycle Rear Air Shock Absorbers Black - Improved

Our review of the 320mm Universal Motorcycle Rear Air Shock Absorbers finds this pair best for riders who want a straightforward suspension upgrade without a factory rebuild. These shocks are designed for a wide range of 150cc to 750cc street bikes, scooters, mopeds and ATVs, and the single biggest reason to buy is the combination of a large CNC aluminum reservoir and nitrogen damping that noticeably smooths out bumps and reduces bottoming out for everyday riding and light off-road use.

Key Features

• 320mm Eye to Eye: The measured eye to eye distance is the main fitment guide and helps ensure a direct bolt-on replacement for many small to mid displacement bikes and quads.
• CNC Aluminum Reservoir: A large capacity CNC machined aluminum reservoir improves heat dissipation and keeps damping performance more consistent during longer rides.
• Nitrogen Damping: Rear nitrogen shock technology filters out minor bumps and absorbs larger impacts for a more controlled, comfortable ride.
• Steel and Aluminum Construction: Mixed materials offer durability where needed and keep weight reasonable while resisting deformation under load.
• Adjustable Spring Preload: The preload can be changed with a tool so riders can tune compression feel for load, acceleration or passenger weight.
• Universal Fit Range: Intended for 150cc to 750cc machines, scooters and ATVs, making it a flexible option for many modification projects.

Who It's For

This product is geared toward hobbyists and mechanics who perform basic suspension upgrades on dirt bikes, dual sport machines, quads and small street bikes. It is particularly useful for owners of Coolster-style and similarly sized motorcycles who need an easy-to-install replacement that improves ride quality and reduces bottoming out.

Riders who require fully tunable, high-end race shocks with extensive external adjusters or a specific proprietary mounting geometry should look elsewhere; this unit relies on the 320mm eye to eye measurement and offers preload and nitrogen damping rather than multi-stage remote adjustments.

Pros & Cons

Pros

• Improved ride quality and dampening compared with many stock shocks, reducing harshness over bumps.
• Easy installation for compatible bikes, with customers reporting bolt-on fit to common 125cc and similar machines.
• Durable CNC reservoir and mixed steel/aluminum construction for longevity and heat control.
• Adjustable spring preload and nitrogen system allow basic tuning for load and comfort.

Cons

• Fitment depends entirely on the 320mm eye to eye dimension, so careful measurement is required before purchase.
• Not a substitute for high-end race shocks if you need advanced external damping adjustments.

Specifications

Brand	GZYF
Eye to Eye Distance	320mm (use as fitment reference)
Fitment Range	150cc to 750cc street bikes, scooters, mopeds, quads and ATVs
Reservoir	CNC large capacity aluminum reservoir
Damping	Nitrogen rear shock damping
Construction	Solid steel body with aluminum alloy components
Adjustment	Tool-adjustable spring preload

Our Verdict

The 320mm Universal Rear Air Shock Absorbers are a practical upgrade for riders seeking better comfort and controlled dampening without complex setup. For compatible 150cc-750cc bikes and small ATVs this offers good value: durable materials, a heat-dissipating reservoir and basic adjustability make it a reliable replacement that improves everyday ride quality.

Frequently Asked Questions

How do I confirm fitment?
Measure the eye to eye distance on your current shock; the 320mm specification is the primary compatibility check.

Can I adjust rebound and compression?
The unit provides spring preload adjustment and nitrogen damping but does not offer multi-stage external rebound/compression knobs like race shocks.

Are these suitable for off-road use?
Yes for light off-road and dual sport riding; the reservoir and nitrogen damping help on rougher surfaces but extreme competition use may need higher-spec shocks.